Architecture based testing how mbt may help
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Architecture-based Testing: how MBT may help?. Software Architecture (traditional understanding). The Software Architecture is the earliest model of the whole software system created along the software lifecycle

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Software architecture traditional understanding
Software Architecture (traditional understanding)

The Software Architecture is the earliest model of the whole software system created along the software lifecycle

SA as a high level design blueprint of the system to be used during the system development and later on for maintenance and reuse

Describes (in a more or less “formal” notation) how a system is structured intocomponents and connectors(SA topology) and how these elements interact(SA dynamics)


Software architecture
Software Architecture

  • Let us reason about the Gaudi’s Sagrada Familia

  • Selected components/interfaces/connectors

  • Selected SA Style and constraints

  • Expected behavior

  • HW/SW/Deployment views

  • Components’ Nesting and sub-systems

  • NF attributes


Software architecture recent future understanding
Software Architecture (recent/future understanding)

  • A set of architecture design decisions taken to generate the architecture artifact

    • An SA is not only the “output” of the design decision process

      • Design issues, alternative solutions, rationale

  • Focus on set of Views and Viewpoints, looking at stakeholders and their concerns

    • Different stakeholders require different views, to solve different concerns

      • ISO/IEC 42010 (just approved)


Design decisions views

3

2

1

4

0

5

Design Decisions & views

  • Why a certain architectural style has been selected?

  • Why a certain technology has been selected?

  • Why the centralized data solution is more appropriate?

  • Dependencies among decisions

  • Structural, Behavioral, Trust, Financial, Performance, … views


Example
Example

Picture taken from: http://www.watblog.com/2010/08/18/tcs-to-build-the-%E2%80%98nano-of-it%E2%80%99-cheap-cloud-computing-india/


Sa based testing and regression testing
SA-based Testing and Regression Testing

  • An implementation should conform to the Architectural specification

    • Is my implementation really compliant to my architectural specification… [and my design decisions]

  • SA structure and behavior models used to generate SA-level test specifications

  • Lessons learned:

    • The “distance” between SA and code is challenging

    • The SA model is (by definition) partial and incomplete

    • non-determinism

    • Regression Testing to manage the architectural drift

  • Previous work: [TSE04] [JSS06]


    Software architecture based testing in practice
    Software Architecture-based testing in practice

    • A project is ongoing with the SEI, on architecture-based testing

      • CMU SEI, University of L’Aquila, CNR-Pisa

    • Goal:

      • To identify industrial needs related to SA-based testing

      • To identify potential solutions to driving examples

      • To identify how the testing/analysis community may help to solve industrial needs and driving examples


    Tentative driving problem

    ?

    +

    ?

    +

    Tentative driving problem

    +

    Fly test

    [Pictures taken from Google Images]


    Question
    Question

    • How (your experience with) MBT may help to deal with this type of problems?

    • A working group is being formed

      • MBT, regressiong testing, component-based testing, product line testing, formal verification, software architecture, …

  • I will appreciate any feedback you might provide


  • References
    References

    • [TSE04] H. Muccini, A. Bertolino and P. Inverardi, "Using Software Architecture for Code Testing". In IEEE Transactions on Software Engineering, Vol. 30, Number 3, March 2004, pp. 160-171.

    • [JSS06] H. Muccini, M. Dias and D. J. Richardson, "Software Architecture-based Regression Testing“.In the Journal of Systems and Software (JSS), Special Issue on "Architecting Dependable Systems". Vol. 79, Issue 10 , October 2006, Pages 1379-1396.


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